Method and device for tracking movement between a surface...

Details Method and device for tracking movement between a surface... Method and device for tracking movement between a surface...

2007-03-20

2007-03-20

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C345S166000, C382S107000

Reexamination Certificate

active

11285848

ABSTRACT:
In one embodiment, movement between a surface and an imager is tracked by using the imager to acquire a series of digital images of the surface. Each of the digital images represents a pattern of light that is reflected from the surface. If a first number of the digital images have surface qualities that are above a surface quality threshold set to an initial value, ones of the series of digital images are compared to track movement between the surface and the imager. If a second number of the digital images have surface qualities that are below the surface quality threshold, then i) the surface quality threshold is dynamically lowered to a new value, and thereafter ii) ones of the series of digital images are compared to track movement between the surface and the imager. Other embodiments are also disclosed.

REFERENCES:
patent: 2004/0160411 (2004-08-01), Yang
patent: 2005/0012022 (2005-01-01), Lin

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